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Author |
Preunkert S, Legrand M, Frey M M, Kukui A, Savarino J, Gallée H, King M, Jourdain B, Vicars W, Helmig D, |
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Title |
Formaldehyde (HCHO) in air, snow, and interstitial air at Concordia (East Antarctic Plateau) in summer
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Type |
Journal Article |
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Year |
2015 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
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Volume |
15 |
Issue |
12 |
Pages |
6689-6705 |
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Abstract |
During the 2011/12 and 2012/13 austral summers, HCHO was investigated for the first time in ambient air, snow, and interstitial air at the Concordia site, located near Dome C on the East Antarctic Plateau, by deploying an Aerolaser AL-4021 analyzer. Snow emission fluxes were estimated from vertical gradients of mixing ratios observed at 1 cm and 1 m above the snow surface as well as in interstitial air a few centimeters below the surface and in air just above the snowpack. Typical flux values range between 1 and 2 × 1012 molecules m-2 s-1 at night and 3 and 5 × 1012 molecules m-2 s-1 at noon. Shading experiments suggest that the photochemical HCHO production in the snowpack at Concordia remains negligible compared to temperature-driven air–snow exchanges. At 1 m above the snow surface, the observed mean mixing ratio of 130 pptv and its diurnal cycle characterized by a slight decrease around noon are quite well reproduced by 1-D simulations that include snow emissions and gas-phase methane oxidation chemistry. Simulations indicate that the gas-phase production from CH4 oxidation largely contributes (66%) to the observed HCHO mixing ratios. In addition, HCHO snow emissions account for ~ 30% at night and ~ 10% at noon to the observed HCHO levels. |
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903 |
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Copernicus GmbH |
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1680-7316 |
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yes |
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Serial |
6158 |
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Author |
Gorodetskaya I V, Kneifel S, Maahn M, Thiery W, Schween J H, Mangold A, Crewell S, Van Lipzig N P M, |
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Title |
Cloud and precipitation properties from ground-based remote-sensing instruments in East Antarctica
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Type |
Journal Article |
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Year |
2015 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
9 |
Issue |
1 |
Pages |
285-304 |
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411 |
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Copernicus GmbH |
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ISSN |
1994-0416 |
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yes |
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Call Number |
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Serial |
6193 |
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Author |
Amory C, Trouvilliez A, Gallée H, Favier V, Naaim-Bouvet F, Genthon C, Agosta C, Piard L, Bellot H, |
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Title |
Comparison between observed and simulated aeolian snow mass fluxes in Adélie Land, East Antarctica
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Type |
Journal Article |
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Year |
2015 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
9 |
Issue |
4 |
Pages |
1373-1383 |
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411 |
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Copernicus GmbH |
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ISSN |
1994-0416 |
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yes |
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Call Number |
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Serial |
6195 |
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Author |
Bazin L, Landais A, Masson-Delmotte V, Ritz C, Picard G, Capron E, Jouzel J, Dumont M, Leuenberger M, Prié F, |
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Title |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores
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Type |
Journal Article |
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Year |
2015 |
Publication |
Climate of the Past Discussions |
Abbreviated Journal |
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Volume |
11 |
Issue |
2 |
Pages |
1437-1477 |
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Abstract |
Orbital tuning is central for ice core chronologies beyond annual layer counting, available back to 60 ka (i.e. thousand of years before 1950) for Greenland ice cores.
While several complementary orbital tuning tools have recently been developed using delta 18O atm,delta O2/N2, and air content with different orbital targets, quantifying their uncertainties remains a challenge. Indeed, the exact processes linking variations of these parameters, measured in the air trapped in ice, to their orbital targets are not yet fully nderstood. Here, we provide new series of delta O2/N2 and delta 18O atm data encompassing Marine Isotopic Stage (MIS) 5 (between 100–160 ka) and the oldest part(380–800 ka) of the East Antarctic EPICA Dome C (EDC) ice core. For the first time, the measurements over MIS 5 allow an inter-comparison of delta O2/N2 and delta 18O atm records from three East Antarctic ice core sites (EDC, Vostok and Dome F). This comparison highlights a site-specific relationship between delta O2/N2 and its local summer solstice insolation. Such a relationship increases the uncertainty associated with the use of delta O2/N2 as a tool for orbital tuning. Combining records of delta 18O atm and delta O2/N2 from Vostok and EDC, we evidence a loss of orbital signature for these two parameters during periods of minimum eccentricity (~400,~720–800 ka). Our dataset reveals a time-varying lag between delta O2/N2 and delta 18O atm over the last 800 ka that we interpret as variations of the lag between delta 18O atm and precession. Large lags of ~5 ka are identified during Terminations I and II, associated with strong Heinrich events. On the opposite, minimal lags (~1–2 ka) are identified during four periods characterized by high eccentricity, intermediate ice volume and no Heinrich events (MIS 6–7, the end of MIS 9, MIS 15 and MIS 17). We therefore suggest that the occurrence of Heinrich events influences the response of delta 18O atm to precession. |
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Programme |
902 |
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Publisher |
Copernicus GmbH |
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ISSN |
1814-9359 |
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yes |
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Call Number |
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Serial |
6199 |
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Author |
Gallée H, Preunkert S, Argentini S, Frey M M, Genthon C, Jourdain B, Pietroni I, Casasanta G, Barral H, Vignon E, Amory C, Legrand M, |
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Title |
Characterization of the boundary layer at Dome C (East Antarctica) during the OPALE summer campaign
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Type |
Journal Article |
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Year |
2015 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
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Volume |
15 |
Issue |
11 |
Pages |
6225-6236 |
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Keywords |
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Abstract |
Regional climate model MAR (Modèle Atmosphérique Régional) was run for the region of Dome C located on the East Antarctic plateau, during Antarctic summer 2011–2012, in order to refine our understanding of meteorological conditions during the OPALE tropospheric chemistry campaign. A very high vertical resolution is set up in the lower troposphere, with a grid spacing of roughly 2 m. Model output is compared with temperatures and winds observed near the surface and from a 45 m high tower as well as sodar and radiation data. MAR is generally in very good agreement with the observations, but sometimes underestimates cloud formation, leading to an underestimation of the simulated downward long-wave radiation. Absorbed short-wave radiation may also be slightly overestimated due to an underestimation of the snow albedo, and this influences the surface energy budget and atmospheric turbulence. Nevertheless, the model provides sufficiently reliable information about surface turbulent fluxes, vertical profiles of vertical diffusion coefficients and boundary layer height when discussing the representativeness of chemical measurements made nearby the ground surface during field campaigns conducted at Concordia station located at Dome C (3233 m above sea level). |
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Programme |
414,903,1013 |
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Thesis |
Bachelor's thesis |
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Publisher |
Copernicus GmbH |
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ISSN |
1680-7316 |
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Approved |
yes |
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Call Number |
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Serial |
6213 |
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Author |
Song S, Selin N E, Soerensen A L, Angot H, Artz R, Brooks S, Brunke E-G, Conley G, Dommergue A, Ebinghaus R, Holsen T M, Jaffe D A, Kang S, Kelley P, Luke W T, Magand O, Marumoto K, Pfaffhuber K A, Ren X, Sheu G-R, Slemr F, Warneke T, Weigelt A, Weiss-Penzias P, Wip D C, Zhang Q, |
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Title |
Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling
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Type |
Journal Article |
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Year |
2015 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
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Volume |
15 |
Issue |
12 |
Pages |
7103-7125 |
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Abstract |
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Programme |
1028 |
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Publisher |
Copernicus GmbH |
Place of Publication |
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ISSN |
1680-7316 |
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Approved |
yes |
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Call Number |
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Serial |
6219 |
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Author |
Gallée H, Barral H, Vignon E, Genthon C, |
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Title |
A case study of a low-level jet during OPALE
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Type |
Journal Article |
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Year |
2015 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
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Volume |
15 |
Issue |
11 |
Pages |
6237-6246 |
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Programme |
1013 |
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Publisher |
Copernicus GmbH |
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yes |
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Call Number |
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Serial |
6250 |
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Author |
Descamps Sébastien, Bohec Céline Le, Maho Yvon Le, Gendner Jean-Paul, Gauthier-Clerc Michel, |
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Title |
Relating Demographic Performance to Breeding-Site Location in the King Penguin
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Type |
Journal Article |
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Year |
2009 |
Publication |
The Condor |
Abbreviated Journal |
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Volume |
111 |
Issue |
1 |
Pages |
81-87 |
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Abstract |
In colonial species, it is often assumed that locations in the center of the colony are of highest quality and provide highest breeding success. We tested this prediction, known as the “central-periphery model,” in a King Penguin colony in the subantarctic Crozet Archipelago. Breeding activity and survival of 150 penguins, fitted with transponder tags, were monitored over an entire breeding season. Among these 150 birds, 50 bred on the slope at the upper periphery of the colony, where the rates of predation and parasitism by ticks were high. Fifty birds bred in the center of the colony, where rates of predation and tick parasitism were low, and 50 bred at the lower end of the colony, where the rate of tick parasitism was low but predation and flooding were important risks. We predicted that the center of the colony should provide the safest breeding place and consequently be characterized by the highest breeding success and be used by the highest-quality individuals. Yet we found that penguins breeding in the center of the colony had the same breeding success as those at both peripheral locations. In addition, penguins breeding on the upper slope had a higher survival rate than penguins breeding at the center or bottom of the slope and were likely of higher quality. Our study does not support the central-periphery model and emphasizes the complexity behind the relationships among breeding site, breeding success, and individual quality. |
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Programme |
137 |
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Publisher |
Cooper Ornithological Society |
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ISSN |
0010-5422 |
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yes |
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Call Number |
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Serial |
2864 |
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Author |
Maj Emilie, |
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Title |
Le sauvage et le domestique dans la métaphore équestre du chamane iakoute
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Type |
Journal Article |
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Year |
2010 |
Publication |
Études mongoles, sibériennes, centrasiatiques et tibétaines |
Abbreviated Journal |
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Issue |
41 |
Pages |
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Keywords |
animal, cervidé, chamanisme, cheval, comparaison, comparison, deer, domestication, élevage, horse, Iakoute, Iakoutie, religion, représentations, rituel, sauvage, shamanism, Sibérie orientale, Sibérie septentrionale, wild, |
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Abstract |
Chez les Iakoutes, éleveurs de chevaux et de vaches au nord-est de la Sibérie, le chamane, tel qu'il est décrit à la fin du xixe siècle dans lethnographie russe nexiste plus. Si autrefois, il lui arrivait de revêtir des peaux de cheval ou d'imiter le comportement de cet animal lors de rituels collectifs, ce n'est plus le cas des nouveaux chamanes dans l'actuelle Iakoutie. Cet article traite de la métaphore équestre dans le chamanisme décrit par les ethnographes à laube du xxe siècle. Selon ce (...)
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1024 |
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CEMS / EPHE |
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ISSN |
0003-5521 |
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yes |
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Call Number |
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Serial |
1576 |
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Author |
Kennicutt MC, Chown SL, Cassano JJ, Liggett D, Peck LS, Massom R, Rintoul SR, Storey J, Vaughan DG, Wilson TJ, Allison I, Ayton J, Badhe R, Baeseman J, Barrett PJ, Bell RE, Bertler N, Bo S, Brandt A, Bromwich D, Cary SC, Clark MS, Convey P, Costa ES, Cowan D, Deconto R, Dunbar R, Elfring C, Escutia C, Francis J, Fricker HA, Fukuchi M, Gilbert N, Gutt J, Havermans C, Hik D, Hosie G, Jones C, Kim YD, Le Maho Y, Lee SH, Leppe M, Leitchenkov G, Li X, Lipenkov V, Lochte K, López-Martínez J, Lüdecke C, Lyons W, Marenssi S, Miller H, Morozova P, Naish T, Nayak S, Ravindra R, Retamales J, Ricci CA, Rogan-Finnemore M, Ropert-Coudert Y, Samah AA, Sanson L, Scambos T, Schloss IR, Shiraishi K, Siegert MJ, Simões JC, Storey B, Sparrow MD, Wall DH, Walsh JC, Wilson G, Winther JG, Xavier JC, Yang H, Sutherland WJ, |
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Title |
A roadmap for Antarctic and Southern Ocean science for the next two decades and beyond
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Type |
Journal Article |
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Year |
2014 |
Publication |
Antarctic Science |
Abbreviated Journal |
Antarct. Sci. |
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Volume |
27 |
Issue |
01 |
Pages |
3-18 |
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Keywords |
Scientific Committee on Antarctic Research, extraordinary logistics, future directions, horizon scan, research priorities, technological challenges, |
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Abstract |
Antarctic and Southern Ocean science is vital to understanding natural variability, the processes that govern global change and the role of humans in the Earth and climate system. The potential for new knowledge to be gained from future Antarctic science is substantial. Therefore, the international Antarctic community came together to ‘scan the horizon’ to identify the highest priority scientific questions that researchers should aspire to answer in the next two decades and beyond. Wide consultation was a fundamental principle for the development of a collective, international view of the most important future directions in Antarctic science. From the many possibilities, the horizon scan identified 80 key scientific questions through structured debate, discussion, revision and voting. Questions were clustered into seven topics: i) Antarctic atmosphere and global connections, ii) Southern Ocean and sea ice in a warming world, iii) ice sheet and sea level, iv) the dynamic Earth, v) life on the precipice, vi) near-Earth space and beyond, and vii) human presence in Antarctica. Answering the questions identified by the horizon scan will require innovative experimental designs, novel applications of technology, invention of next-generation field and laboratory approaches, and expanded observing systems and networks. Unbiased, non-contaminating procedures will be required to retrieve the requisite air, biota, sediment, rock, ice and water samples. Sustained year-round access to Antarctica and the Southern Ocean will be essential to increase winter-time measurements. Improved models are needed that represent Antarctica and the Southern Ocean in the Earth System, and provide predictions at spatial and temporal resolutions useful for decision making. A co-ordinated portfolio of cross-disciplinary science, based on new models of international collaboration, will be essential as no scientist, programme or nation can realize these aspirations alone. |
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Programme |
1091 |
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Publisher |
Cambridge University Press |
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ISSN |
0954-1020 |
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Approved |
yes |
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Call Number |
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Serial |
6153 |
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| Permanent link to this record |
